<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <!--true登录 不显示    false未登录 显示-->
  <div v-if="!isLogin">
    <a href="javascript:void(0)">注册</a>
    <!--如果超链接点击时 不离开此页面时需要添加javascript:void(0)-->
    <a href="javascript:void(0)" @click="isLogin=true">登录</a>
  </div>
  <div v-else>
    <input type="text" v-model="newName">
    <input type="button" value="添加"  @click="arr.push(newName)">
    <a href="javascript:void(0)" @click="isLogin=false">登出</a>
  </div>
  <ul>
    <li v-for="name in arr">{{name}}</li>
  </ul>
</div>
<!--引入-->
<script src="../js/vue.js"></script>
<script>
  /*创建Vue对象*/
  let v = new Vue({
    el:"body>div",
    data:{
      arr: ["刘备", "关羽"],
      isLogin:false,
      newName:""
  },
  })
</script>
</body>
</html>